MAL-2026-17437 Malicious code in @bluewin/utils (npm)

@bluewin/utils is a dependency-confusion package: it describes itself as a "PoC package for dependency confusion testing" and claims the @bluewin scope, so a build that resolves that scope from the public registry runs its code instead of the intended private package. Its postinstall script runs node postinstall.js on npm install, which sends an HTTPS request to https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils, a Burp Collaborator endpoint, disclosing the installing host's IP address and that it installed the package. It collects no further data, but unreviewed code from an outside publisher has run with the installing user's privileges. The npm account securityresearch1 published it on 2026-10-01.

@bluewin/[email protected] ships a postinstall lifecycle script that performs an HTTPS GET to a hardcoded Burp Collaborator subdomain at https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils on every install. The request path embeds the package coordinate, and the outbound DNS resolution and HTTP hit confirm code execution on the installer's machine and disclose the installer's resolver/egress IP to the operator of the oastify.com subdomain. The @bluewin scope and utility name are consistent with a dependency-confusion probe targeting an internal package namespace: any build system that resolves @bluewin/utils from the public npm registry instead of a private registry will fetch and run this beacon at install time. Although the behavior is a reconnaissance beacon rather than a full payload, it establishes attacker-side confirmation of exploitability and leaks environment metadata without consent.